Weather on May 18 in Ottawa
Historical weather data for May 18 in Ottawa, Canada
Avg High19°C (67°F)
Avg Low8°C (46°F)
Warmest201725°C
Coldest19764°C
Based on 55 years of data from OTTAWA CDA
About This Date
May 18th in Ottawa, Canada typically brings mild spring weather, with average highs around 19°C and lows near 8°C. Over 55 years of records, the warmest May 18th was in 2017 (25°C average), while the coldest was 1976 (4°C) — a 37°F range across recorded history. Precipitation has occurred on 35% of recorded May 18th dates, with snow falling 2% of the time. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 18th in Ottawa? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 16°C (60°F) | 8°C (47°F) | -- |
| 2024 | 24°C (75°F) | 13°C (56°F) | 0.05" |
| 2023 | 17°C (62°F) | -1°C (31°F) | 0" |
| 2022 | 19°C (66°F) | 5°C (41°F) | 0" |
| 2021 | 26°C (79°F) | 13°C (55°F) | 0" |
| 2020 | 21°C (70°F) | 11°C (51°F) | 0" |
| 2019 | 16°C (60°F) | 6°C (43°F) | 0.48" |
| 2018 | 18°C (64°F) | 6°C (42°F) | 0" |
| 2017 | 30°C (86°F) | 20°C (68°F) | 0.08" |
| 2016 | 17°C (63°F) | 6°C (42°F) | 0" |
| 2015 | 29°C (85°F) | 11°C (51°F) | 0.16" |
| 2014 | 16°C (60°F) | 4°C (40°F) | 0" |
| 2013 | 23°C (73°F) | 4°C (39°F) | 0" |
| 2012 | 22°C (72°F) | 4°C (39°F) | 0" |
| 2011 | 17°C (62°F) | 9°C (49°F) | 0.07" |
| 2010 | 25°C (77°F) | 8°C (47°F) | 0" |
| 2009 | 14°C (58°F) | 2°C (36°F) | 0" |
| 2008 | 17°C (62°F) | 4°C (40°F) | 0.57" |
| 2007 | 17°C (62°F) | 2°C (35°F) | 0" |
| 2006 | 17°C (62°F) | 12°C (53°F) | 0.89" |
| 2005 | 14°C (57°F) | 4°C (39°F) | 0.11" |
| 2004 | 21°C (69°F) | 16°C (60°F) | 0.6" |
| 2003 | 24°C (76°F) | 8°C (46°F) | 0" |
| 2002 | 8°C (46°F) | 3°C (38°F) | 0" |
| 2001 | 21°C (69°F) | 10°C (50°F) | 1.46" |
| 2000 | 13°C (55°F) | 10°C (50°F) | 0.73" |
| 1999 | 28°C (82°F) | 16°C (60°F) | 0" |
| 1998 | 26°C (79°F) | 13°C (55°F) | 0" |
| 1997 | 17°C (63°F) | 3°C (38°F) | 0.04" |
| 1996 | 26°C (79°F) | 14°C (58°F) | 0.96" |
| 1995 | 17°C (62°F) | 4°C (39°F) | 0" |
| 1994 | 17°C (62°F) | 4°C (40°F) | 0.18" |
| 1993 | 17°C (63°F) | 1°C (34°F) | 0" |
| 1992 | 16°C (61°F) | 8°C (46°F) | 0" |
| 1991 | 16°C (60°F) | 4°C (40°F) | 0" |
| 1990 | 15°C (59°F) | 8°C (46°F) | 0.28" |
| 1989 | 30°C (86°F) | 12°C (53°F) | 0" |
| 1988 | 18°C (65°F) | 8°C (46°F) | 0" |
| 1987 | 15°C (59°F) | 11°C (51°F) | 0" |
| 1986 | 27°C (80°F) | 13°C (55°F) | 1.97" |
| 1985 | 15°C (59°F) | 4°C (40°F) | 0" |
| 1984 | 18°C (64°F) | 4°C (40°F) | 0" |
| 1983 | 17°C (63°F) | 0°C (32°F) | 0" |
| 1982 | 22°C (72°F) | 11°C (51°F) | 0" |
| 1981 | 13°C (56°F) | 1°C (33°F) | 0" |
| 1980 | 14°C (58°F) | 10°C (50°F) | 1.9" |
| 1979 | 23°C (74°F) | 6°C (42°F) | 0" |
| 1978 | 21°C (69°F) | 10°C (50°F) | 0" |
| 1977 | 24°C (76°F) | 18°C (65°F) | 0" |
| 1976 | 6°C (43°F) | 3°C (38°F) | 2.16" |
| 1975 | 26°C (79°F) | 11°C (52°F) | 0" |
| 1974 | 17°C (63°F) | 8°C (47°F) | 0" |
| 1973 | 9°C (48°F) | 6°C (42°F) | 2.26" |
| 1972 | 24°C (75°F) | 8°C (47°F) | 0" |
| 1971 | 26°C (79°F) | 9°C (49°F) | 0" |